There is a strikingly close resemblance between sound waves and the way they are set up in the air by a mechanically vibrating body.

A Vacuum tube is more sensitive than a crystal detector because it rectifies the oscillating current in receiving circuits and works as an amplifier all at once

Though the vacuum tube detector has more complicated circuits than a crystal detector, it doesn't require constant adjustment like the crystal detector.

A short wave receiving set is one that will receive a range of wave lengths of from 150 to 600 meters.

All receiving sets that receive over a range of wave lengths of from 150 meters to 3,000 meters are called intermediate wave sets.

In 2002, there were four different ways used to break up the continuous waves of a wireless telegraph transmitter into groups. Let's discuss them.

Wireless Headphones.--A telephone receiver for a wireless receiving set is made exactly on the same principle as an ordinary Bell telephone receiver.

To understand how a vacuum tube acts as a detector and as an amplifier you must first know what electrons are.

if you have alternating current service in your home you can install a long-distance continuous wave telegraph transmitter

Sending wireless telegraph messages by continuous waves has many features that rank it above sending them by periodic waves.

In time past, the most difficult of all electrical apparatus for the amateur to make, install and work was the wireless telephone.

To make a tube set up powerful oscillations then, it is only necessary that an oscillation circuit shall be provided.

The following set is inexpensive, and with this cheap, little portable receptor you can get the Morse code from stations a hundred miles distant.